What is the correct method to adjust tonal range using Levels?

What is the correct method to adjust tonal range using Levels?

• A. Levels automatically adjust without sliders.
• B. Use Curves to adjust tonal range.
• C. Use Levels (Ctrl/Cmd+L), move the Input Shadow, Midtone, and Highlight sliders to stretch or compress tonal range while keeping detail.
• D. Copy and paste levels from another image.

Answer: (C)